Angle resolved photoemission spectroscopy reveals spin charge separation in metallic MoSe₂ grain boundary.

ABSTRACT: Material line defects are one-dimensional structures but the search and proof of electron behaviour consistent with the reduced dimension of such defects has been so far unsuccessful. Here we show using angle resolved photoemission spectroscopy that twin-grain boundaries in the layered semiconductor MoSe₂ exhibit parabolic metallic bands. The one-dimensional nature is evident from a charge density wave transition, whose periodicity is given by k_F/π, consistent with scanning tunnelling microscopy and angle resolved photoemission measurements. Most importantly, we provide evidence for spin- and charge-separation, the hallmark of one-dimensional quantum liquids. Our studies show that the spectral line splits into distinctive spinon and holon excitations whose dispersions

SUBMITTER: Ma Y 

PROVIDER: S-EPMC5303875 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature